They found that speech signals are normally low-pitched and musical clips have a wide range of pitches; both vary only gradually over time.

他们发现语音信号通常都是低沉的，而音乐片段的音调范围却很广泛；二者都会随着时间的推移有不同的变化。

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They found that speech signals are normally low-pitched and musical clips have a wide range of pitches; both vary only gradually over time.

他们发现语音信号通常都是低沉的，而音乐片段的音调范围却很广泛；二者都会随着时间的推移有不同的变化。

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